Re: Mirror in space
Jason Hatton (jason.hatton@etss.u-strasbg.fr)
Thu, 23 Jul 1998 15:51:54 +0000
Hi All,
Following the thread of discussion on the Znamya space mirror expt., I
agree entirely that a system of space based mirrors would be a major
nuisance to ground based astronomy. However, I think we should get into
perspective the actual test that is planned in November, details of
which can be found at the web site of the organisation developing this
device (a subsidary of Energiya);
http://www.energialtd.com/znamya.htm
This is a progression from an earlier experiment flown in 1992 to test
the deployment of large thin film structures in space & potential
application as a "space illumination system". In this case a large
rotating reflective structure was deployed from the docking port of a
progress spacecraft & used to shine a beam of sunlight, approximately
5km in diameter, onto the earth. A similar system will be used in
November. The entire experiment will only last about 24h, before the
structure is jettisoned, after which it will probably re-enter within a
few days.
I had the opportunity to meet the director of the Znamaya project
several months ago, Vladimir Syromyatnikov. From my discussion with him
concerning this experiment I have the impression again that the main
goal is demonstrating the deployment & operation of a thin film
structure. Use as reflector is only one of several applications.
However, using it as a reflector to light up a city is certainly one way
to get publicity!
I think if this experiment is successful it will do a lot to make the
case AGAINST use of this technology. Think about it, if the inhibatants
of several major cities across the world get a taste of what it's like
to have a mag -14 artificial moon lighting up the night sky there is
going to be a lot of public debate before anyone tries putting up a
permananent "space illumination system".
Wishing everyone clear & dark skies,
Jason